EP0751378A2 - Dispositif pour la détermination du débit massique de l'air - Google Patents

Dispositif pour la détermination du débit massique de l'air Download PDF

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Publication number
EP0751378A2
EP0751378A2 EP96102870A EP96102870A EP0751378A2 EP 0751378 A2 EP0751378 A2 EP 0751378A2 EP 96102870 A EP96102870 A EP 96102870A EP 96102870 A EP96102870 A EP 96102870A EP 0751378 A2 EP0751378 A2 EP 0751378A2
Authority
EP
European Patent Office
Prior art keywords
mass flow
carrier
air
air mass
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96102870A
Other languages
German (de)
English (en)
Other versions
EP0751378A3 (fr
EP0751378B1 (fr
Inventor
Thomas Wienecke
Ralf Schmitt
Karl-Heinrich Dr. Lösing
Günter Liedtke
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pierburg GmbH
Original Assignee
Pierburg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pierburg GmbH filed Critical Pierburg GmbH
Publication of EP0751378A2 publication Critical patent/EP0751378A2/fr
Publication of EP0751378A3 publication Critical patent/EP0751378A3/fr
Application granted granted Critical
Publication of EP0751378B1 publication Critical patent/EP0751378B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/696—Circuits therefor, e.g. constant-current flow meters
    • G01F1/698—Feedback or rebalancing circuits, e.g. self heated constant temperature flowmeters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G01F1/68—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using thermal effects
    • G01F1/684—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow
    • G01F1/688—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element
    • G01F1/69—Structural arrangements; Mounting of elements, e.g. in relation to fluid flow using a particular type of heating, cooling or sensing element of resistive type

Definitions

  • the invention relates to a device for determining the air mass flow in an intake duct of an internal combustion engine, consisting of an intake duct section housing in which a temperature measuring element and a thermal mass flow sensor are arranged one behind the other in the flow direction.
  • Such a device is known for example from DE-C2-31 35 793, in which the problem is dealt with:
  • the measurement signal has an error which is based on the fact that the device also measures the mass of the air air flowing back due to the pulsation in the intake pipe of the internal combustion engine.
  • the flow direction sensor has a first temperature-dependent indication resistor, which is arranged on a carrier and whose resistance value is detected by a resistance measuring circuit and is compared with a resistance value, detected by a further resistance measuring circuit, of a second temperature-dependent indication resistor arranged in the flow direction at a distance from the first indication resistor, the difference the resistance values are used to influence the measurement signal.
  • a first temperature-dependent indication resistor which is arranged on a carrier and whose resistance value is detected by a resistance measuring circuit and is compared with a resistance value, detected by a further resistance measuring circuit, of a second temperature-dependent indication resistor arranged in the flow direction at a distance from the first indication resistor, the difference the resistance values are used to influence the measurement signal.
  • the object of the invention is to design the generic device in such a way that compensation of the measurement signal error caused by pulsation can be achieved with a reduced component expenditure.
  • the invention is based on the finding that, in the case of a laminar flow, a greater heat transfer into the flowing medium takes place in the flowing medium at the end of the flow around the body than at the end of the body facing away from the flow.
  • the invention makes use of this.
  • FIG. 1 shows an intake duct section 1 of an internal combustion engine with a first carrier 2, on which two meandering mass flow sensors 3, 4 are arranged one behind the other in the air flow direction and are connected to their end connections 5 and connected to ground. Input connections 6 of the mass flow sensors 3, 4 are connected to a circuit 7, which is described below. On a further carrier 8, two temperature sensors 9, 10 are arranged, which are also part of the circuit 7. This carrier 8 is arranged at a distance from the other carrier 2, as a result of which a direct flow against the first carrier 2 is achieved, as in the case of a backflow, even with a pre-flow.
  • FIG. 2 shows an alternative embodiment of the first carrier 2, ie for the mass flow sensor 4, which is mainly exposed to the backflow, it has a larger area part 11 than for the other mass flow sensor 3. This measure serves to compensate for a lower return flow velocity or a non-direct inflow in the event of eddy formation.
  • Fig. 3 shows the basic circuit 7.
  • This circuit 7 consists of the two mass flow sensors 3, 4 which are arranged on the carrier 2, which is exposed to the air flow.
  • the mass flow sensors 3, 4 are connected to their end connections 5 and connected to ground.
  • Each mass flow sensor 3, 4 is acted upon in a bridge circuit 12, 13 by the output current of a control amplifier 14, 15, the temperature sensors 9, 10 being arranged in each bridge branch, ie they are arranged on the other carrier 8 and are likewise exposed to the air flow.
  • the formula value K is an arbitrary factor that is used to adapt the device to various motors. It has proven to be advantageous if the value K (U M1 - U M2 ) is limited to maximum values which are determined as a function of U M1 , U M2 in order to avoid overcompensation.
  • the air mass flow sensor 4 which is predominantly acted upon by the return flow of the air, occupies a larger area portion of the carrier 2 than the other, which corresponds to a lower return flow speed. It can also be provided that this air mass sensor 4 has a smaller resistance value than the other and / or another, z. B. has a higher working temperature range.
  • Fig. 4 shows a diagram from the characteristics of the air mass flow against the output signal of the mass flow sensor can be seen, the full line applies to a mass flow sensor according to the invention and the dashed line for one of the prior art, i. H. without compensation of the backflow. From the latter it can easily be seen that, compared to the full line, there are operating areas with backflow, namely due to deflections of the chain line.

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Measuring Volume Flow (AREA)
EP96102870A 1995-06-29 1996-02-27 Dispositif pour la détermination du débit massique de l'air Expired - Lifetime EP0751378B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19523701A DE19523701A1 (de) 1995-06-29 1995-06-29 Vorrichtung zur Bestimmung des Luftmassenstromes
DE19523701 1995-06-29

Publications (3)

Publication Number Publication Date
EP0751378A2 true EP0751378A2 (fr) 1997-01-02
EP0751378A3 EP0751378A3 (fr) 1997-05-28
EP0751378B1 EP0751378B1 (fr) 2002-12-18

Family

ID=7765585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96102870A Expired - Lifetime EP0751378B1 (fr) 1995-06-29 1996-02-27 Dispositif pour la détermination du débit massique de l'air

Country Status (3)

Country Link
EP (1) EP0751378B1 (fr)
DE (2) DE19523701A1 (fr)
ES (1) ES2188682T3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10133120C2 (de) * 2001-07-07 2003-09-04 Draeger Medical Ag Hitzdrahtanemometer
DE10324292B4 (de) 2003-05-21 2018-03-15 Robert Bosch Gmbh Messelement für einen Durchflusssensor, insbesondere einen Luftmassensensor für Brennkraftmaschinen
DE102010033175B3 (de) * 2010-08-03 2011-12-08 Pierburg Gmbh Verfahren zur Bestimmung eines resultierenden Gesamtmassenstroms an einem Abgasmassenstromsensor

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135793A1 (de) * 1981-09-10 1983-03-24 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und vorrichtung zur messung der masse eines in einem stroemungsquerschnitt stroemenden pulsierenden mediums
FR2599153A1 (fr) * 1986-05-23 1987-11-27 Djorup Robert Anemometre a transducteur thermique directionnel
JPH02141623A (ja) * 1988-11-24 1990-05-31 Japan Electron Control Syst Co Ltd 吸入空気流量検出装置
DE3935778A1 (de) * 1989-10-27 1990-10-31 Daimler Benz Ag Vorrichtung zur messung der masse eines stroemenden mediums
US5263369A (en) * 1992-07-24 1993-11-23 Bear Medical Systems, Inc. Flow sensor system and method
JPH075009A (ja) * 1993-06-15 1995-01-10 Hitachi Ltd エンジンの空気流量測定装置、燃料噴射制御装置及びこれらに用いる流量センサ

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135793A1 (de) * 1981-09-10 1983-03-24 Robert Bosch Gmbh, 7000 Stuttgart Verfahren und vorrichtung zur messung der masse eines in einem stroemungsquerschnitt stroemenden pulsierenden mediums
FR2599153A1 (fr) * 1986-05-23 1987-11-27 Djorup Robert Anemometre a transducteur thermique directionnel
JPH02141623A (ja) * 1988-11-24 1990-05-31 Japan Electron Control Syst Co Ltd 吸入空気流量検出装置
DE3935778A1 (de) * 1989-10-27 1990-10-31 Daimler Benz Ag Vorrichtung zur messung der masse eines stroemenden mediums
US5263369A (en) * 1992-07-24 1993-11-23 Bear Medical Systems, Inc. Flow sensor system and method
JPH075009A (ja) * 1993-06-15 1995-01-10 Hitachi Ltd エンジンの空気流量測定装置、燃料噴射制御装置及びこれらに用いる流量センサ

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 014, no. 376 (P-1092), 14.August 1990 & JP 02 141623 A (JAPAN ELECTRON CONTROL SYST CO LTD) *
PATENT ABSTRACTS OF JAPAN vol. 95, no. 4, 31.Mai 1995 & JP 07 005009 A (HITACHI LTD) *

Also Published As

Publication number Publication date
DE59609988D1 (de) 2003-01-30
EP0751378A3 (fr) 1997-05-28
ES2188682T3 (es) 2003-07-01
EP0751378B1 (fr) 2002-12-18
DE19523701A1 (de) 1997-01-02

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